The answer is D because the air is made of nitrogen and oxygen. The reaction is endothermic.
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Answer:
If it contains only 2 elements it will begin with “hydro” as in
hydrochloric acid (HCl). If it contains more than 2 elements it is named based on the polyatomic (oxy) anion, as in nitric acid (HNO3), nitrous acid (HNO2), sulfuric acid (H2SO4). If the element has more than one possible charge, the value of the charge comes after the element name and before the word ion. Thus, Fe 2+ is the iron two ion, while Fe 3+ is the iron three ion.
Explanation:
I believe the answer is the third one.
The answer I believe would be A